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I found their reviews to be a bit too rosy and not highlighting the weak points of the products properly. But I do not find them to be biased.

The most honest source is Voja's My Deep Guide Channel on YouTube. Very detailed and informative reviews.

I do like Voja as well. I just don't think he gets to review as many devices overall.

But, it stands to reason that since Voja is not running an e-reader shop, that he would be more objective.